One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(9,10,12,14)(11,15,16,13)(18,22)(23,31)(24,25)(26,32)(2,6)(7,8)(17,18,20,22)(19,26,27,32)(21,24,29,25)(23,30,31,28)(1,3,5,4)(2,7,6,8)(9,11,12,16)(10,13,14,15)(17,19,20,27)(18,23,22,31)(21,30,29,28)(24,26,25,32)(1,4,5,3)(2,8,6,7)(18,24)(21,29)(22,25)(23,26)(28,30)(31,32)(19,27)(23,31)(26,32)(28,30) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.